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11.
Quang NH Long NQ Lieu DB Mai TT Ha NT Nhan DD Hien PD 《Journal of environmental radioactivity》2004,75(3):329-337
Fallout 239+240Pu, 238Pu, 90Sr and 137Cs inventories in surface soils were measured for 20 locations in northern Vietnam yielding the mean values (+/- standard error) of 26.5+/-3.8 Bq m(-2) for 239+240Pu, 1048+/-143 Bq m(-2) for 137Cs and 212+/-28 Bq m(-2) for 90Sr. The concentrations of 137Cs and plutonium isotopes strongly correlate with each other resulting in a stable 239+240Pu/137Cs inventory ratio of 0.025+/-0.002. Among soil parameters, organic matter and fulvic acids strongly correlate with caesium and plutonium isotopes, especially in the 0-10 cm layer. 137Cs and 239+240Pu are distributed rather similarly over the 0-10 cm and 10-20 cm layers. At locations with high contents of sand (82-93%) along the South China Sea coast, the downward percolation by rainwater results in a higher accumulation of 239+240Pu and 137Cs in the 10-20 cm layer. The mean 137Cs/ 90Sr inventory ratio is 9.3+/-2.2, and the correlation is weak between these isotopes. 相似文献
12.
Roman Seidl Fridolin Simon Brand Michael Stauffacher Pius Krütli Quang Bao Le Andy Spörri Grégoire Meylan Corinne Moser Monica Berger González Roland Werner Scholz 《Ambio》2013,42(1):5-12
Interdisciplinary scientific knowledge is necessary but not sufficient when it comes to addressing sustainable transformations, as science increasingly has to deal with normative and value-related issues. A systems perspective on coupled human–environmental systems (HES) helps to address the inherent complexities. Additionally, a thorough interaction between science and society (i.e., transdisciplinarity = TD) is necessary, as sustainable transitions are sometimes contested and can cause conflicts. In order to navigate complexities regarding the delicate interaction of scientific research with societal decisions these processes must proceed in a structured and functional way. We thus propose HES-based TD processes to provide a basis for reorganizing science in coming decades. 相似文献
13.
Estimating the generation of recycled metals from obsolete motorcycles in Vietnam for ELV management
Kurogi Daiki Kosai Shoki Murakami Genya Phong Lai Thai Quang Nguyen Duc Huy Tran Duc Luong Nguyen Yamasue Eiji 《Journal of Material Cycles and Waste Management》2021,23(4):1563-1575
Journal of Material Cycles and Waste Management - The demand for various modes of transportation has significantly increased around the world due to rapid urbanization, the increase in population,... 相似文献
14.
Cuong Van Hoang Tuyen Quang Tran Yen Hai Thi Nguyen Lan Thanh Nguyen 《Natural resources forum》2020,44(4):311-333
Using secondary data from a socio-economic quantitative household survey of the North Central region of Vietnam, the main aim of our study is to analyze the causal effect of forest resources on household income and poverty. Based on the observed characteristics of a forest-based livelihood and forest-related activities, we use a propensity score matching (PSM) method to control for potential bias arising from self-selection. The PSM results indicate that households with a forest-based livelihood had a higher level of income and lower poverty rates than did those without. Interestingly, our findings confirm that a forest-based livelihood offers much higher income than any other type of livelihood adopted by local households. Also, the poverty rate among households with a forest-based livelihood is lower than those earning non-labor income or engaged in wage/crop and crop livelihoods. Among households and provinces, we find varying opportunities deriving from forest resources, suggesting that there are potential barriers hindering local households from pursuing a forest livelihood or participating in some forest activities. Therefore, government policy and regulations on forest management should focus on improving the access of households to forest resources, while enhancing the sustainability of these resources. 相似文献
15.
16.
Arsenic in groundwaters of the Lower Mekong 总被引:1,自引:0,他引:1
Stanger G Truong TV Ngoc KS Luyen TV Thanh TT 《Environmental geochemistry and health》2005,27(4):341-357
Increasing incidence and awareness of arsenic in many alluvial aquifers of South-east Asia has raised concern over possible
arsenic in the Lower Mekong Basin. Here, we have undertaken new research and reviewed many previous small-scale studies to
provide a comprehensive overview of the status of arsenic in aquifers of Cambodia and the Cuu Long Delta of Vietnam. In general
natural arsenic originates from the Upper Mekong basin, rather than from the local geology, and is widespread in soils at
typical concentrations of between 8 and 16 ppm; (dry weight). Industrial and agricultural arsenic is localised and relatively
unimportant compared to the natural alluvial arsenic. Aquifers most typically contain groundwaters of no more than 10 μg L−1, although scattered anomalous areas of 10 to 30 μg L−1 are also quite common. The most serious, but possibly ephemeral arsenic anomalies, of up to 600 μg L−1, are associated with iron and organic-rich flood-plain sediments subject to very large flood-related fluctuations in water
level, resulting in transient arsenopyrite dissolution under oxidizing conditions. In general, however, high-arsenic groundwaters
result from the competing interaction between sorption and dissolution processes, in which arsenic is only released under
reducing and slightly alkaline conditions. High arsenic groundwaters are found both in shallow water-tables, and in deeper
aquifers of between 100 and 120 m depth. There is no evidence of widespread arsenicosis, but there are serious localised health-hazards,
and some risk of low-level arsenic ingestion through indirect pathways, such as through contaminated rice and aquaculture.
An almost ubiquitous presence of arsenic in soils, together with the likelihood of greatly increased groundwater extraction
in the future, will require continuing caution in water resources development throughout the region. 相似文献
17.
The effects of chloride, nitrate, perchlorate and sulfate ions on the rates of the decomposition of hydrogen peroxide and the oxidation of organic compounds by the Fenton's process have been investigated. Experiments were conducted in a batch reactor, in the dark at pH < or = 3.0 and at 25 degrees C. Data obtained from Fe(II)/H2O2 experiments with [Fe(II)]0/[H2O2]0 > or = 2 mol mol(-1), showed that the rates of reaction between Fe(II) and H2O2 followed the order SO4(2-) > ClO4(-) = NO3- = Cl-. For the Fe(III)/H2O2 process, identical rates were obtained in the presence of nitrate and perchlorate, whereas the presence of sulfate or chloride markedly decreased the rates of decomposition of H2O2 by Fe(III) and the rates of oxidation of atrazine ([atrazine]0 = 0.83 microM), 4-nitrophenol ([4-NP]0 = 1 mM) and acetic acid ([acetic acid]0 = 2 mM). These inhibitory effects have been attributed to a decrease of the rate of generation of hydroxyl radicals resulting from the formation of Fe(III) complexes and the formation of less reactive (SO4(*-)) or much less reactive (Cl2(*-)) inorganic radicals. 相似文献
18.
Quang A. Phung Allen L. Thompson Claire Baffaut Christine Costello E. John Sadler Bohumil M. Svoma Anthony Lupo Sagar Gautam 《Journal of the American Water Resources Association》2019,55(5):1196-1215
Anticipating changes in hydrologic variables is essential for making socioeconomic water resource decisions. This study aims to assess the potential impact of land use and climate change on the hydrologic processes of a primarily rain‐fed, agriculturally based watershed in Missouri. A detailed evaluation was performed using the Soil and Water Assessment Tool for the near future (2020–2039) and mid‐century (2040–2059). Land use scenarios were mapped using the Conversion of Land Use and its Effects model. Ensemble results, based on 19 climate models, indicated a temperature increase of about 1.0°C in near future and 2.0°C in mid‐century. Combined climate and land use change scenarios showed distinct annual and seasonal hydrologic variations. Annual precipitation was projected to increase from 6% to 7%, which resulted in 14% more spring days with soil water content equal to or exceeding field capacity in mid‐century. However, summer precipitation was projected to decrease, a critical factor for crop growth. Higher temperatures led to increased potential evapotranspiration during the growing season. Combined with changes in precipitation patterns, this resulted in an increased need for irrigation by 38 mm representing a 10% increase in total irrigation water use. Analysis from multiple land use scenarios indicated converting agriculture to forest land can potentially mitigate the effects of climate change on streamflow, thus ensuring future water availability. 相似文献
19.
Anthropogenic influence on surface water quality of the Nhue and Day sub-river systems in Vietnam 总被引:2,自引:0,他引:2
Pham Thi Minh Hanh Suthipong Sthiannopkao Kyoung-Woong Kim Dang The Ba Nguyen Quang Hung 《Environmental geochemistry and health》2010,32(3):227-236
In order to investigate the temporal and spatial variations of 14 physical and chemical surface water parameters in the Nhue
and Day sub-river systems of Vietnam, surface water samples were taken from 43 sampling sites during the dry and rainy seasons
in 2007. The results were statistically examined by Mann–Whitney U-test and hierarchical cluster analysis. The results show that water quality of the Day River was significantly improved during
the rainy season while this was not the case of the Nhue River. However, the river water did not meet the Vietnamese surface
water quality standards for dissolved oxygen (DO), biological oxygen demand (BOD5), chemical oxygen demand (COD), nutrients, total coliform, and fecal coliform. This implies that the health of local communities
using untreated river water for drinking purposes as well as irrigation of vegetables may be at risk. Forty-three sampling
sites were grouped into four main clusters on the basis of water quality characteristics with particular reference to geographic
location and land use and revealed the contamination levels from anthropogenic sources. 相似文献
20.
Le Hoang Anh Thu Do Ha Khoi Ngo Quang 《Journal of Material Cycles and Waste Management》2021,23(6):2232-2241
Journal of Material Cycles and Waste Management - The main objective of the study is to explore the economic feasibility of power generation from rice straw, a potential biomass energy resource, in... 相似文献